Laser rock spallation is a rock removal process that utilizes laser induced thermal stress to fracture and cause a break through the rock by creating small fragments before melting of the rock. In this paper we invest...Laser rock spallation is a rock removal process that utilizes laser induced thermal stress to fracture and cause a break through the rock by creating small fragments before melting of the rock. In this paper we investigated the effects of CO2 laser irradiation on limestone of Iran Sarvak formation. Since the limestone included heavy and light oil, we studied the amount of laser beam absorption by this oils for determining thermal fractured during the laser drilling laboratory process. In order to characterize this limestone spectrophotometry (from UV to NIR), scanning electron microscopy (SEM) have been used.展开更多
In this paper the excitation temperature in a Gd hollow cathode lamp is measured for the first time. This measurement has made with considering of lamp spectra. One of the important measurements in plasma before using...In this paper the excitation temperature in a Gd hollow cathode lamp is measured for the first time. This measurement has made with considering of lamp spectra. One of the important measurements in plasma before using it as an interaction region with laser, is measuring of excitation temperature. Hollow cathode lamps are one of these regions. In this paper a Gd hollow cathode lamps with Ne as buffer gas is used as a plasma region. And the excitation temperature is measured. When the lamp current was 10 mA, the excitation temperature is measured 3000K.展开更多
DCJ, one of the DCM derivatives, has been used as a laser dye and a red emitter or a red dopant for OLED devices in recent decade. 4-(dicyanomethylene)-2-methyl-6-(julolidyl-9-enyl)-4H-pyran (DCJ) containing julolidin...DCJ, one of the DCM derivatives, has been used as a laser dye and a red emitter or a red dopant for OLED devices in recent decade. 4-(dicyanomethylene)-2-methyl-6-(julolidyl-9-enyl)-4H-pyran (DCJ) containing julolidine group has been synthesized for use as a red fluorescent dye molecule in organic light-emitting di- odes (OLEDs). In this paper, we reported a facile, simple and inexpensive procedure of purification of DCJ without necessity of HPLC analysis. The maximum absorption, emission, quantum efficiency are increasing in DCJ with the electron-donating of julolidine group.展开更多
Relative metastable level population of metal plasma having low-lying metastable states departs from equi-librium value. It needs to be experimentally investigated. This paper reports the use of hollow cathode lamp ba...Relative metastable level population of metal plasma having low-lying metastable states departs from equi-librium value. It needs to be experimentally investigated. This paper reports the use of hollow cathode lamp based Laser Induced Fluorescence (LIF) spectroscopy technique to measure Relative metastable level popu-lation of metal in a plasma produced by a hollow cathode lamp. The relative population of ground state and 533 cm-1 levels of Gd atoms in hollow cathode lamp is measured with LIF method.展开更多
文摘Laser rock spallation is a rock removal process that utilizes laser induced thermal stress to fracture and cause a break through the rock by creating small fragments before melting of the rock. In this paper we investigated the effects of CO2 laser irradiation on limestone of Iran Sarvak formation. Since the limestone included heavy and light oil, we studied the amount of laser beam absorption by this oils for determining thermal fractured during the laser drilling laboratory process. In order to characterize this limestone spectrophotometry (from UV to NIR), scanning electron microscopy (SEM) have been used.
文摘In this paper the excitation temperature in a Gd hollow cathode lamp is measured for the first time. This measurement has made with considering of lamp spectra. One of the important measurements in plasma before using it as an interaction region with laser, is measuring of excitation temperature. Hollow cathode lamps are one of these regions. In this paper a Gd hollow cathode lamps with Ne as buffer gas is used as a plasma region. And the excitation temperature is measured. When the lamp current was 10 mA, the excitation temperature is measured 3000K.
文摘DCJ, one of the DCM derivatives, has been used as a laser dye and a red emitter or a red dopant for OLED devices in recent decade. 4-(dicyanomethylene)-2-methyl-6-(julolidyl-9-enyl)-4H-pyran (DCJ) containing julolidine group has been synthesized for use as a red fluorescent dye molecule in organic light-emitting di- odes (OLEDs). In this paper, we reported a facile, simple and inexpensive procedure of purification of DCJ without necessity of HPLC analysis. The maximum absorption, emission, quantum efficiency are increasing in DCJ with the electron-donating of julolidine group.
文摘Relative metastable level population of metal plasma having low-lying metastable states departs from equi-librium value. It needs to be experimentally investigated. This paper reports the use of hollow cathode lamp based Laser Induced Fluorescence (LIF) spectroscopy technique to measure Relative metastable level popu-lation of metal in a plasma produced by a hollow cathode lamp. The relative population of ground state and 533 cm-1 levels of Gd atoms in hollow cathode lamp is measured with LIF method.
